Users are consuming headlines in feeds in their subscriptions. Therefore the online service collects subscribed feeds and state (read or unread) of every headline in subscribed feeds.
Every user is identified by an anonymous randomly generated identifier. To allow synchronization the online service must provide identical identifier in all devices user owns. Therefore every identifier is paired to another anonymous identifier obtained when user signs with a Microsoft Account.
The application collects anonymous information about its usage to improve products and services.
The provider does not provide the collected data to third parties.